JP2924215B2 - G4 facsimile special communication setting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special communication setting method such as confidential communication and relay broadcast communication in a G4 facsimile.

[0002]

2. Description of the Related Art Recently, one subscriber line has two information channels (B channels) and one signal channel (D channel).
Channel has been started, and an ISDN (Integrated Services Digital Network) service has been started.
G4 facsimile machines for transmitting and receiving image information using DN have been developed and used. By the way, G
As a model of a communication protocol used for four facsimile machines, an internationally standardized teletex communication protocol is referred to. This teletex is a service for transmitting an encoded character signal between terminals via a circuit network, and its communication protocol is, as shown in FIG. 2, a plurality of layers structured in layers (hierarchies). Are sequentially executed. For example, at the time of transmission, a transport connection is established in a transport layer by exchanging a transport connection request block (TCR) and a transport connection acceptance block (TCA) which is a response to the transport connection request block (TCR). In the session layer, session setting (such as function setting between terminals for communication) is performed by exchanging a session start command (CSS) and a session start response (RSSP) which is a response to the session start command (CSS). To transfer documents, So that the communication is carried out by sequentially performing the layer defined by the communications protocols. On the other hand, a communication protocol used for the G4 facsimile has been proposed by the ISO (International Organization for Standardization) as a basic configuration for sequentially executing a plurality of layers structured in layers (hierarchy) like Teletex, and each facsimile manufacturer has However, the details of the protocol have not been established yet,
The actual situation was that each facsimile maker made its own settings.

[0003]

SUMMARY OF THE INVENTION The present invention provides a G4 facsimile communication protocol that proposes a method for performing special communication settings such as confidential communication and relay broadcast communication. It is an object of the present invention to provide a G4 facsimile special communication setting method capable of realizing the above.

[0004]

SUMMARY OF THE INVENTION The present invention, proposed to achieve the above object, uses a communication protocol for sequentially executing a plurality of layers including a session layer, and uses an ISD.
A special communication setting method of G4 facsimile for transmitting image information through N information channels, wherein a special area is included in a user area included in session start command data (CSS) transmitted when the session layer is executed. As a special communication setting data for performing communication, an instruction of confidential communication or an instruction of relay broadcast and a plurality of telephone number data of a broadcast destination are allocated in advance and transmitted from the calling terminal to the called terminal. It has been like that.

[0005]

According to the present invention, when an operation such as confidential communication or relay broadcast communication is performed at the time of facsimile transmission, the user area within the user area secured in the session start command data transmitted during execution of the session layer in the communication protocol. Is assigned special communication setting data. And
When the line is connected and each layer is sequentially executed according to the communication protocol, a session start command including special communication setting data is transmitted from the calling terminal to the called terminal during execution of the session layer, and the called terminal is Then, the special communication setting requested by the calling terminal is performed upon receiving the session start command.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is based on a communication protocol P proposed by ISO (International Organization for Standardization), which has seven layers including an application layer, a presentation layer, a session layer, a transport layer, a network layer, a data link layer, and a physical layer. FIG. 4 shows a method of the present invention, in which data required for special communication settings such as confidential communication and relay broadcast communication is transmitted from a calling terminal to a called terminal by a session start command (CSS) when a session layer C is executed. Is what you do.

According to the method of the present invention, when a special communication such as a confidential communication or a relay broadcast is set during facsimile transmission, the user area (512 bytes) secured in the session start command (CSS) is set. The data necessary for the setting of the special communication is written in (area is open to the user). When each layer is sequentially executed according to the communication protocol P and the session layer C is executed, a session start command (CSS) in which necessary setting data including special communication setting data is written is transmitted via the line to the called terminal via the line. Sent to the side. On the called terminal side, the transmitted session start command (CSS)
And performs device setting according to the special communication setting data, and also performs necessary device setting other than the special communication setting. When the device setting is completed, the called terminal returns a session start response (RSSP) to the calling terminal to notify that the setting has been performed as requested by the calling terminal. When the setting cannot be performed, data indicating that the setting cannot be performed is notified to the calling terminal side by a session start response (RSSP). As described above, according to the method of the present invention, it is possible to transmit the special communication setting data using the session layer while complying with the communication protocol proposed by ISO.

In the above description, although the specific contents of the special communication setting data are not mentioned, a control command for instructing confidential communication when confidential communication is set, and a relay command when relay broadcast is set. A control command for instructing the broadcast and a plurality of pieces of telephone number data of the broadcast destination are written in the user area of the session start signal (CSS). In addition to confidential communication and relay broadcast communication, it is also possible to transmit special communication setting data such as time-designated transmission, polling transmission, and polling reception.

[0009]

As can be understood from the above description, according to the special communication setting method of the G4 facsimile of the present invention, the user area secured in the session start command is effectively used when the session layer of the communication protocol is executed. As a result, the special communication setting data can be transmitted efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a G4 facsimile special communication setting method of the present invention.

FIG. 2 is an explanatory diagram of a conventional teletex communication protocol.

[Explanation of symbols]

 C Session layer P Communication protocol

Claims (1)

(57) [Claims] 1. A G4 facsimile special communication setting method for transmitting image information via an ISDN information channel using a communication protocol for sequentially executing a plurality of layers including a session layer, comprising the steps of: Start command data (CS
In the user area included in S), as special communication setting data for performing special communication, an instruction for confidential communication or an instruction for relay broadcast communication and a plurality of telephone number data of a broadcast destination are stored in advance. A special communication setting method for G4 facsimile, characterized in that the communication terminal is assigned and transmitted from the calling terminal to the called terminal.